Thanks for the info folks...
As to why I'm leaving a jet command (as V1GO > 40t), well just look out of the window as another dank, dark, wet, miserable day dawns over Blighty. Add to that the overcrowded roads, massive rates of tax, crap schools for my children. Need I go on ?
I have to say I'm really looking forward to getting started in a couple of weeks, definately worth leaving a command for.